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Test for Chapter 2 in Science Class 10

Chapter 2 of Science Class 10 covers topics related to chemical reactions, including types of reactions, chemical equations, balancing equations, and the law of conservation of mass. To assess students' understanding of these concepts, a test can be designed with the following sections:

Section 1: Multiple Choice Questions

This section can have 10-15 questions with four choices each, covering the basic definitions, properties, and examples of chemical reactions. Some sample questions are:

- Which of the following is not a type of chemical reaction?
a) Synthesis
b) Decomposition
c) Sublimation
d) Combustion
- What is the balanced chemical equation for the reaction of sodium metal with water?
a) Na + H2O → NaOH + H2
b) Na + H2O → Na2O + H2
c) Na + H2O → NaH + H2O2
d) Na + H2O → Na2SO4 + H2
- What is the mass of carbon dioxide produced when 2 moles of methane react with oxygen?
a) 44 g
b) 88 g
c) 22 g
d) 11 g

Section 2: Short Answer Questions

This section can have 5-10 questions that require brief explanations or calculations based on chemical equations and reactions. Some sample questions are:

- Write the chemical equation and balance it for the reaction of lead nitrate with potassium iodide to form lead iodide and potassium nitrate.
- A piece of magnesium ribbon weighs 0.5 g. When burned in air, it reacts with oxygen to form magnesium oxide. If the mass of the product is 0.7 g, what is the mass of oxygen that reacted with magnesium? Show your calculations.
- Identify the type of reaction that occurs when calcium oxide reacts with water to form calcium hydroxide.

Section 3: Essay Questions

This section can have 2-3 questions that require more detailed and analytical responses about the applications and implications of chemical reactions in everyday life, industry, and environment. Some sample questions are:

- Why is the law of conservation of mass important in chemical reactions? Give an example of a reaction that illustrates this law.
- Discuss the role of catalysts in chemical reactions. Give two examples of catalysts and explain how they work.
- Chemical reactions are used in various industries to produce useful products. Choose one industry (e.g., agriculture, pharmaceuticals, energy) and describe how chemical reactions are involved in the production process. What are some environmental and safety concerns associated with this industry?